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.pio/libdeps/esp32-s3-devkitc-1/RTClib/examples/pcf8563/pcf8563.ino

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+// Date and time functions using a PCF8563 RTC connected via I2C and Wire lib
+#include "RTClib.h"
+
+RTC_PCF8563 rtc;
+
+char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
+
+void setup () {
+  Serial.begin(115200);
+
+#ifndef ESP8266
+  while (!Serial); // wait for serial port to connect. Needed for native USB
+#endif
+
+  if (! rtc.begin()) {
+    Serial.println("Couldn't find RTC");
+    Serial.flush();
+    while (1) delay(10);
+  }
+
+  if (rtc.lostPower()) {
+    Serial.println("RTC is NOT initialized, let's set the time!");
+    // When time needs to be set on a new device, or after a power loss, the
+    // following line sets the RTC to the date & time this sketch was compiled
+    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
+    // This line sets the RTC with an explicit date & time, for example to set
+    // January 21, 2014 at 3am you would call:
+    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
+    //
+    // Note: allow 2 seconds after inserting battery or applying external power
+    // without battery before calling adjust(). This gives the PCF8523's
+    // crystal oscillator time to stabilize. If you call adjust() very quickly
+    // after the RTC is powered, lostPower() may still return true.
+  }
+
+  // When time needs to be re-set on a previously configured device, the
+  // following line sets the RTC to the date & time this sketch was compiled
+  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
+  // This line sets the RTC with an explicit date & time, for example to set
+  // January 21, 2014 at 3am you would call:
+  // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
+
+  // When the RTC was stopped and stays connected to the battery, it has
+  // to be restarted by clearing the STOP bit. Let's do this to ensure
+  // the RTC is running.
+  rtc.start();
+}
+
+void loop () {
+    DateTime now = rtc.now();
+
+    Serial.print(now.year(), DEC);
+    Serial.print('/');
+    Serial.print(now.month(), DEC);
+    Serial.print('/');
+    Serial.print(now.day(), DEC);
+    Serial.print(" (");
+    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
+    Serial.print(") ");
+    Serial.print(now.hour(), DEC);
+    Serial.print(':');
+    Serial.print(now.minute(), DEC);
+    Serial.print(':');
+    Serial.print(now.second(), DEC);
+    Serial.println();
+
+    Serial.print(" since midnight 1/1/1970 = ");
+    Serial.print(now.unixtime());
+    Serial.print("s = ");
+    Serial.print(now.unixtime() / 86400L);
+    Serial.println("d");
+
+    // calculate a date which is 7 days, 12 hours and 30 seconds into the future
+    DateTime future (now + TimeSpan(7,12,30,6));
+
+    Serial.print(" now + 7d + 12h + 30m + 6s: ");
+    Serial.print(future.year(), DEC);
+    Serial.print('/');
+    Serial.print(future.month(), DEC);
+    Serial.print('/');
+    Serial.print(future.day(), DEC);
+    Serial.print(' ');
+    Serial.print(future.hour(), DEC);
+    Serial.print(':');
+    Serial.print(future.minute(), DEC);
+    Serial.print(':');
+    Serial.print(future.second(), DEC);
+    Serial.println();
+
+    Serial.println();
+    delay(3000);
+}